src for thumnail img tags wrong

I uploaded a number of files and attached them to a post. At the bottom of the post I placed:
[gallery link="file"]

When generating the page, the src attribute for the img tag is wrong. It is:
https://www.4ahomes.com/00090-150×150.jpg
it should be:
https://www.4ahomes.com/wp/wp-content/uploads/2010/01/00090-150×150.jpg
why is WordPress stripping out the path to the file?

You can see the problem at:
https://www.4ahomes.com/wp/2010/01/12/updated-cape-cod-between-research-complex-and-zoo/
at the bottom of the post.

Note that the same problem is affecting the WP SlideShow Gallery plugin thumbnails which are also not displayed.